Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14580
Not sure which RDBMS are supporting `Using Outer Join`. `NULL` generated by
outer joins are removed. This sounds a little bit strange. After all, `NULL`
also has a meaning.
In the plan (by EXPLAIN), it is not easy to know this is a regular outer
join or using outer join. That is why I think we should introduce a new join
type. At least, users can easily know they are triggering using outer join.
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